Trebuchet sling and plough: what they have in common

1. Step 1. Trebuchet sling — is part of — Trebuchet. It lengthens the throw.
2. Step 2. Trebuchet — is made of — Stone. It hurled stone balls.
3. Step 3. Stone — is material for — Hoe. The working part was of stone or antler.
4. Step 4. Hoe — evolved into — Plough. The plough mechanized loosening the soil with a hoe.

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